920872e083
rtl_lps_enter() and rtl_lps_leave() are using in_interrupt() to detect
whether it is safe to acquire a mutex or if it is required to defer to a
workqueue.
The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be seperated or the context be conveyed in an argument passed by the
caller, which usually knows the context.
in_interrupt() also is only partially correct because it fails to chose the
correct code path when just preemption or interrupts are disabled.
Add an argument 'may_block' to both functions and adjust the callers to
pass the context information.
The following call chains were analyzed to be safe to block:
rtl_watchdog_wq_callback()
rlf_lps_leave/enter()
rtl_op_suspend()
rtl_lps_leave()
rtl_op_bss_info_changed()
rtl_lps_leave()
rtl_op_sw_scan_start()
rtl_lps_leave()
The following call chains were analyzed to be unsafe to block:
_rtl_pci_interrupt()
_rtl_pci_rx_interrupt()
rtl_lps_leave()
_rtl_pci_interrupt()
_rtl_pci_rx_interrupt()
rtl_is_special_data()
rtl_lps_leave()
_rtl_pci_interrupt()
_rtl_pci_rx_interrupt()
rtl_is_special_data()
setup_special_tx()
rtl_lps_leave()
_rtl_pci_interrupt()
_rtl_pci_tx_isr
rtl_lps_leave()
halbtc_leave_lps()
rtl_lps_leave()
This leaves four callers of rtl_lps_enter/leave() where the analyzis
stopped dead in the maze of several nested pointer based callchains and
lack of rtlwifi hardware to debug this via tracing:
halbtc_leave_lps(), halbtc_enter_lps(), halbtc_normal_lps(),
halbtc_pre_normal_lps()
These four have been cautionally marked to be unable to block which is the
safe option, but the rtwifi wizards should be able to clarify that.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.